Shortcut procedure for simulating batch distillation operations

A fast, accurate model for batch distillation simulation will be useful both in batch distillation synthesis and in batch process design. A shortcut model using the Fenske-Underwood-Gilliland (FUG) equations of continuous distillation design was developed. The model consists of stepping forward in time using a first-order explicit integration scheme with a variable time step and solving the FUG equations at each time step. A large number of example problems were used for model testing and validation. Agreement between the shortcut model and rigorous simulation was excellent. The model is a powerful and computationally fast tool that can be used both in batch process design and in synthesis of batch distillation systems.